Cylinder assembly of compressor

ABSTRACT

A cylinder assembly of a compressor includes: a cylinder having a cylindrical inner space partitioned into a first space and a second space as partition plate of a rotational shaft is inserted thereinto and a step insertion portion formed at both sides thereof in a ring shape; a first bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at one side of the cylinder so as to cover the inner space of the cylinder; and a second bearing having the rotational shaft coupled at the central portion thereof and being inserted to be coupled into the step insertion portion formed at the other side of the cylinder so as to cover the inner space of the cylinder. A dead volume is reduced and thus a re-expansion loss of a refrigerant gas can be reduced.

TECHNICAL FIELD

[0001] The present invention relates to a cylinder assembly of a compressor, and more particularly, to a cylinder assembly of a compressor that is capable of heightening a concentricity between a cylinder compressing a gas and bearings coupled thereto, preventing leakage of a compressed gas and reducing a dead volume.

BACKGROUND ART

[0002] In general, a compressor compresses a gas, including a closed container having a certain internal space, an electric mechanism unit mounted within the closed container and generating a driving force, and a compression mechanism unit for receiving the driving force of the electric mechanism unit and compressing a gas.

[0003] The compressor is classified into various types of a rotary type compressor, a reciprocating compressor or a scroll compressor depending on the compression mechanism unit compressing a gas.

[0004]FIGS. 1, 2 and 3 illustrate the compression mechanism unit of a conventional compressor.

[0005] As shown in FIGS. 1, 2 and 3, in the compression mechanism unit of the conventional compressor, a cylindrical inner space (V) is formed, and a rotational shaft 20 is penetratingly inserted to the central portion of a cylinder assembly (K) having a suction passage 11 and a discharge passage 12 respectively communicating with the inner space (V).

[0006] The rotational shaft 20 includes a partition plate 30 with a waveform curve face in shape of sine wave formed at one side of an shaft portion 21 having a certain length.

[0007] As the shaft portion 21 of the rotational shaft 20 is coupled with the electric mechanism unit (M) generating a driving force, the partition plate 30 is positioned inside the inner space (V) of the cylinder assembly (K), so that the inner space (V) is sectioned into first and second spaces 13 and 14.

[0008] Vanes 40-and 41 having a certain thickness and a certain area are insertedly coupled at both sides of the cylinder assembly (K).

[0009] The both sides of the vanes 40 and 41 are respectively in contact with an inner wall of the cylinder assembly (K) and an outer circumferential face of the rotational shaft 20 and lower surfaces thereof are elastically supported so as to be constantly in contact with the contact surface of the partition plate 30. Thus, as the partition plate 30 is rotated, the first and second spaces 13 and 14 are respectively changed into suction areas 13 a and 14 a and compression areas 13 b and 14 b.

[0010] As the discharge passages 12 formed at both sides of the cylinder assembly (K) are opened and closed, an opening and closing unit 50 for discharging a gas compressed in the compression areas 13 b and 14 b of the first and second spaces 13 and 14 is coupled at one side of the first bearing 60 and the second bearing 70.

[0011] As shown in FIG. 3, the cylinder assembly (K) includes: a cylinder 10 having a cylindrical inner space (V) so that the partition plate 30 can be inserted in a cylinder body 15 formed in a certain shape; a first bearing 60 coupled at an upper side of the cylinder 10 (in view of the drawing) to cover the cylinder and supporting the rotational shaft 20; and a second bearing 70 coupled at a lower side (in view of the drawing) of the cylinder 10 and supporting the rotational shaft 20.

[0012] The first and second bearings 60 and 70 respectively include support units 62 and 72 protruded to have a certain height at one side of the bearing bodies 61 and 71 formed to have a certain thickness and a certain area, shaft insertion holes 63 and 73 in which the rotational shaft 20 is inserted, and a combination protrusion units 64 and 74 having an outer diameter corresponding to an inner diameter of the inner space (V) of the cylinder 10 and having a certain height formed at the other side of the bearing bodies 61 and 71.

[0013] Vane slots 65 and 75, in which the vanes 40 and 41 are inserted, are formed at the bearing bodies 61 and 71, and each one side of the vane slots 65 and 75 correspond to an outer circumferential face of the combination protrusion units 64 and 74.

[0014] A discharge passage 12 is penetratingly formed at the bearing bodies 61 and 71 of the first and second bearing, and the opening and closing unit 50 for opening and closing the discharge hole is coupled to the bearing bodies 61 and 71 by being in contact with the side portion of the bearing bodies.

[0015] The vanes 40 and 41 are respectively inserted into the vane slots 65 and 75 of the first and second bearings 60 and 70, and the vanes 40 and 41 are elastically supported by an elastic support unit 43.

[0016] The operation of the compressor as constructed above will now be described.

[0017] First, when the rotational shaft 20 is rotated upon receive of the driving force from the electric mechanism unit (M), the partition plate 30 coupled to the rotational shaft 20 is rotated in the inner space (V) formed inside the cylinder assembly (K).

[0018] As the partition plate 30 is rotated in-the inner space (V) of the cylinder assembly (K), the first space 13 and the second space 14 are changed into suction areas 13 a and 14 a and compression areas 13 b and 14 b and the suction passage 11 penetratingly formed in the cylinder bodies 61 and 71 of the cylinder 10 communicates with the first space 13 and the second space 14, so that a refrigerant gas is sucked, compressed and discharged through the discharge passage 12.

[0019] However, the conventional art has such a structure that the combination protrusion units 64 and 74 of the first and second bearings 60 and 70 are inserted into the cylinder 10. Thus, in order to correspond the concentricity of the first and second bearings 60 and 70 and the cylinder 10 and prevent leakage of a high temperature and high pressure gas of the inner space (V) of the cylinder, the combination protrusion units 64 and 74 of the first and second bearings 60 and 70 need to be formed thick. But in such a case, the path of the discharge passage 12, that is, a dead volume, is increased only to make a large re-expansion loss, resulting in degradation of a compression efficiency.

DISCLOSURE OF THE INVENTION

[0020] Therefore, it is an object of the present invention to provide a cylinder assembly of a compressor that is capable of heightening a concentricity between a cylinder compressing a gas and bearings coupled thereto, preventing leakage of a compressed gas and reducing a dead volume.

[0021] To achieve these objects, there is provided a cylinder assembly of a compressor including: a cylinder having a cylindrical inner space partitioned into a first space and a second space as partition plate of a rotational shaft is inserted thereinto and a step insertion portion formed at both sides thereof in a ring shape; a first bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at one side of the cylinder so as to cover the inner space of the cylinder; and a second bearing having the rotational shaft coupled at the central portion thereof and being inserted to be coupled into the step insertion portion formed at the other side of the cylinder so as to cover the inner space of the cylinder.

[0022] To achieve the above objects, there is also provided a cylinder assembly of a compressor including: a cylinder having a cylindrical inner space partitioned into a first space and a second space as partition plate of a rotational shaft is inserted thereinto and a step insertion portion formed at both sides thereof in a ring shape; a first bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at one side of the cylinder so as to cover the inner space of the cylinder; a second bearing having the rotational shaft coupled at the central portion thereof and being inserted to be coupled into the step insertion portion formed at the other side of the cylinder so as to cover the inner space of the cylinder; vanes respectively inserted into the first and second bearings and changing the first and second spaces of the cylinder into a suction area and a compression area as the partition plate coupled to the rotational shaft is rotated; an elastic support unit elastically coupled between the first and second bearings and the vanes; and an opening and closing unit for opening and closing a discharge hole penetratingly formed at the first and second bearings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0023]FIG. 1 is a front sectional view of a compression mechanism unit of a compressor in accordance with a conventional art;

[0024]FIG. 2 is a plan view of the compression mechanism unit of a compressor in accordance with the conventional art;

[0025]FIG. 3 is an exploded perspective view of the compression mechanism unit of a compressor in accordance with the conventional art;

[0026]FIG. 4 is a front sectional view of a compression mechanism unit of a compressor having a cylinder assembly in accordance with the present invention;

[0027]FIG. 5 is a plan view of the compression mechanism unit of a compressor having a cylinder assembly in accordance with the present invention; and

[0028]FIG. 6 is an exploded perspective view of the compression mechanism unit of a compressor having a cylinder assembly in accordance with the present invention.

MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS

[0029] A cylinder assembly of a compressor in accordance with the present invention will now be described with reference to the accompanying drawings.

[0030]FIGS. 4, 5 and 6 illustrate compression mechanism unit of a compressor having a cylinder assembly in accordance with a preferred embodiment of the present invention.

[0031] As shown in FIGS. 4, 5 and 6, a compression mechanism unit of the compressor includes a cylindrical inner space (W) therein, and a rotational shaft 20 is penetratingly inserted into the central portion of a cylinder assembly (R) having a suction passage 111 and a discharge passage 112 respectively communicating with the inner space (W).

[0032] The rotational shaft 20 includes a partition plate 30 formed with a waveform curved face in a sine wave form at one side of the shaft portion 21 having a certain length.

[0033] Accordingly, as the shaft portion 21 of the rotational shaft 20 is coupled with the electric mechanism unit (M) generating a driving force, the partition plate 30 is positioned in the inner space (W) of the cylinder assembly (R), so that the inner space (W) is partitioned into first and second spaces 113 and 114.

[0034] Vanes 40 and 41 having a certain thickness and a certain area are insertedly coupled at both sides of the cylinder assembly (R).

[0035] Both sides of the vanes 40 and 41 are respectively in contact with an inner wall of the inner space (W) of the cylinder assembly (R) and an outer circumferential face of the rotational shaft 20 and elastically supported so that their lower surfaces are constantly come in contact with the contact surface of the partition plate 30. Accordingly, as the partition plate 30 is rotated, the first and second spaces 113 and 114 are changed into the suction areas 113 a and 114 a and the compression areas 113 b and 114 b.

[0036] An opening and closing unit 50 is coupled at both sides of the cylinder assembly (R) so as to discharge a gas compressed in the compression areas 113 b and 114 b of the first and second spaces 113 and 114 by opening and closing the discharge passage 112.

[0037] As shown in FIG. 6, the cylinder assembly (R) includes: a cylinder 110 having a cylindrical inner space (W) in a cylinder body (115) formed in a certain shape so that the partition plate 30 can be inserted and a step insertion portion 116 formed to have a step in a ring shape at both sides of the cylinder body 115; a first bearing 160 having supports units 162 and 172 formed protruded in a ring shape with a certain height at the center of bearing bodies 161 and 171 with an outer diameter corresponding to an inner diameter of the cylinder step insertion portion 116 and a certain thickness, shaft insertion holes 163 and 173 formed inside the support units 162 and 172 into which the rotational shaft 20 is inserted, and vane slots 164 and 174 formed at each one side of the bearing bodies 161 and 171, into which the vanes 40 and 41 are inserted; and a second bearing 170 formed in a shape corresponding to the first bearing 160 and coupled in the opposite shape to the cylinder.

[0038] The inner diameter of the step insertion portion 116 of the cylinder 110 is larger than the inner diameter of the inner space (W).

[0039] Assembling of the cylinder assembly (R) will now be described.

[0040] In a state that the rotational shaft 20 with the partition plate 30 combined thereto is inserted in the inner space (W), the rotational shaft 20 is inserted in the shaft insertion hole 163, and the first bearing 160 is insertedly coupled into the step insertion portion 116 so as to cover one side of the inner space (W).

[0041] In the second bearing 170, the rotational shaft 20 is inserted into the shaft insertion hole 173 and insertedly coupled into the step insertion portion 116 of the other side so as to cover the other side of the inner space (W) of the cylinder 110.

[0042] The discharge passage 112 is formed at the bearing bodies 161 and 171 of the first and second bearings 160 and 170, and an opening and closing unit 50 is coupled at the side portion so as to open and close the discharge passage 112.

[0043] The suction passage 111 is formed at one side of the cylinder 110 so as to suck a gas.

[0044] The vanes 40 and 41 are respectively inserted into the vane slots 164 and 174 of the first and second bearings 160 and 170. The vanes 40 and 41 are elastically supported by the elastic support unit 43.

[0045] The operation and effect of the cylinder assembly of the compressor of the present invention will now be described.

[0046] First, when the rotational shaft 20 is rotated upon receipt of the driving force of the electric mechanism unit (M), the partition plate 30 of the rotational shaft 20 is rotated in the inner space (W) formed inside the cylinder assembly (R).

[0047] As the partition plate 30 is rotated in the inner space (W) of the cylinder assembly (R), a refrigerant gas is sucked from the suction passage 111 of the first space 113 and the second space 114, compressed, and then discharged through the discharge passage 112 by the operation of the opening and closing unit 50.

[0048] Thus, in the present invention, the inner space (W) of the cylinder 110 is covered from both sides and the first bearing 160 and the second bearing 170 supporting the rotational shaft 20 are insertedly coupled into the step insertion portion 116 formed at both sides of the body 115 of the cylinder 110. Thus, a high temperature and high pressure gas compressed inside the inner space (W) of the cylinder 110 is prevented from leaking between the cylinder 110 and the first and second bearings 160 and 170, and when the cylinder 80 and the first and second bearings 160 and 170 are coupled, the concentricity becomes accurate.

[0049] In addition, since the first and second bearings 160 and 170 are coupled in a state of being inserted into the step insertion portion 116 of the cylinder 110, the first and second bearings 160 and 170 has a relatively reduced thickness, so that the volume of the discharge passage 112 penetratingly formed in the first and second bearings 160 and 170 can be relatively reduced.

[0050] As so far described, the cylinder assembly of a compressor of the present invention has many advantages.

[0051] That is, first, the high temperature and high pressure gas compressed in the inner space of the cylinder is prevented from leaking.

[0052] Secondly, since the concentricity of the cylinder and the first and second bearings is heightened, a compression performance is improved and the parts are smoothly operated.

[0053] Lastly, as the dead volume is reduced, a re-expansion loss is reduced and the compression efficiency can be more heightened. 

1. A cylinder assembly of a compressor comprising: a cylinder having a cylindrical inner space partitioned into a first space and a second space as partition plate of a rotational shaft is inserted thereinto and a step insertion portion formed at both sides thereof in a ring shape; a first bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at one side of the cylinder so as to cover the inner space of the cylinder; and a second bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at the other side of the cylinder so as to cover the inner space of the cylinder.
 2. The cylinder assembly of claim 1, wherein an outer diameter of the first and second bearings and an inner diameter of the step insertion portion of the cylinder are formed to be corresponded each other.
 3. The cylinder assembly of claim 1, wherein the inner diameter of the step insertion portion of the cylinder is greater than the outer diameter of the inner space formed inside the cylinder.
 4. A cylinder assembly of a compressor comprising: a cylinder having a cylindrical inner space partitioned into a first space and a second space as partition plate of a rotational shaft is inserted thereinto and a step insertion portion formed at both sides thereof in a ring shape; a first bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at one side of the cylinder so as to cover the inner space of the cylinder; a second bearing having the rotational shaft coupled at a central portion and being inserted to be coupled into the step insertion portion formed at the other side of the cylinder so as to cover the inner space of the cylinder; vanes respectively inserted into the first and second bearings and changing the first and second spaces of the cylinder into a suction area and a compression area as the partition plate coupled to the rotational shaft is rotated; an elastic support unit elastically coupled between the first and second bearings and the vanes; and an opening and closing unit for opening and closing a discharge hole penetratingly formed at the first and second bearings.
 5. The cylinder assembly of claim 4, wherein an outer diameter of the first and second bearings and an inner diameter of the step insertion portion of the cylinder are formed to be corresponded each other.
 6. The cylinder assembly of claim 1, wherein the inner diameter of the step insertion portion of the cylinder is greater than the outer diameter of the inner space formed inside the cylinder.
 7. The cylinder assembly of claim 4, wherein the elastic support unit is a compression coil spring.
 8. The cylinder assembly of claim 4, wherein the elastic support unit is a plate spring. 